Mitsubishi Montero (2002-2004). Manual — part 727

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-605

STEP 8. Check connector D-135 at PCM for damage.
Q: Is the connector in good condition?

YES : Go to Step 9.
NO : Repair or replace it. Refer to GROUP 00E, Harness

Connector Inspection

P.00E-2

. Then go to Step 12.

STEP 9. Check for harness damage between accelerator
pedal position sensor connector D-138 (terminal No. 2) and
PCM connector D-135 (terminal No. 92).
Q: Is the harness wire in good condition?

YES : Go to Step 10.
NO : Repair it. Then go to Step 12.

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-606

STEP 10. Check for harness damage between accelerator
pedal position sensor connector D-138 (terminal No. 3) and
PCM connector D-135 (terminal No. 114).
Q: Is the harness wire in good condition?

YES : Go to Step 11.
NO : Repair it. Then go to Step 12.

STEP 11. Using scan tool MB991502, check data list item
78: Accelerator Pedal Position Sensor (main).

CAUTION

To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK"(OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item

78, Accelerator Pedal Position Sensor (main).

• Output voltage is between 0.905 and 1.165 volts when

foot is released from accelerator pedal.

• Output voltage is 4.035 volts or higher when accelerator

pedal is fully depressed.

(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is the sensor operating properly?

YES : It can be assumed that this malfunction is intermittent.

Refer to GROUP 00, How to Use Troubleshooting/
Inspection. Service Points

P.00-6

.

NO : Replace the PCM. Then go to Step 12.

AK200945

3

4

5

1

2

8

6

7

AB

CONNECTOR: D-138

HARNESS
CONNECTOR:
COMPONENT SIDE

D-138(GR)

AK200947

91

92

93

94

95

96

97

98

99

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

CONNECTOR: D-135

HARNESS CONNECTOR:
COMPONENT SIDE

AB

PCM

D-135(GR)

ACX01539

16-PIN

MB991502

AC

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-607

STEP 12. Using scan tool MB991502, read the diagnostic
trouble code (DTC).
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) After the DTC has been deleted, read the DTC again.
(4) Turn the ignition switch to the "LOCK"(OFF) position.
Q: Is DTC P2122 set?

YES : Retry the troubleshooting.
NO : The inspection is complete.

P2123 Accelerator Pedal Position Sensor (Main) Circuit High Input

ACX01539

16-PIN

MB991502

AC

AK201163

VIOLET

-WHTE

YELLO

W

-RED

BLA

CK

D-138

(MU802073)

5 V

92

2

ACCELERATOR
PEDAL

POSITION
SENSOR
(MAIN)

POWERTRAIN CONTROL MODULE (PCM)

114

91

3

1

Accelerator Pedal Position Sensor (Main) Circuit

9192

939495

96979899

100

105

113114

115116117

118119120

106

107108109

110111112

101102103

104

D-135

(MU803805)

6 7 8

1 2 3 4 5

TSB Revision

DIAGNOSTIC TROUBLE CODE PROCEDURES

13Ac-608

.

CIRCUIT OPERATION

• A 5-volt power supply is applied on the APS

(main) power terminal (terminal No. 2) from the
PCM (terminal No. 92).
The ground terminal (terminal No. 1) is grounded
with PCM (terminal No. 91).

• When the accelerator pedal is moved from the

idle position to the fully opened position, the
resister between the APS (main) output terminal
(terminal No. 3) and ground terminal will increase
according to the rotation.

.

TECHNICAL DESCRIPTION

• The APS (main) outputs voltage which corre-

sponds to the accelerator pedal depression.

• The PCM checks whether the voltage is within a

specified range.

.

DTC SET CONDITIONS

Check Conditions

• Ignition switch "ON" position.

• APS (sub) output voltage is between 0.2 and 2.5

volts.

Judgement Criteria

• APS (sub) output voltage should be 4.5 volts or

higher for 1 seconds.

.

TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)

• APS failed or maladjusted.

• Open or shorted APS (main) circuit, or loose con-

nector.

• PCM failed.

AK201038AF

CONNECTOR: D-135

PCM

D-135(GR)

AK200944

ACCELERATOR
PEDAL
POSITION
SENSOR

AB

D-138(GR)

CONNECTOR: D-138